Granted Patent
Utility
US 6,676,253 · App. 10/195,418
Air pressure regulating device for ink cartridges
Inventors:
Chi-Chung Hsu, Wen-Chung Chen
Patented Case
View Patent ↗
Granted: Jan 13, 2004
Filed: Jul 16, 2002
Inventors
Chi-Chung Hsu
Wen-Chung Chen
Assignee (at issue)
Nanodynamics, Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.